(3+9i)+(12-4i)=0

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Solution for (3+9i)+(12-4i)=0 equation: 



(3+9i)+(12-4i)=0

We add all the numbers together, and all the variables

(9i+3)+(-4i+12)=0

We get rid of parentheses

9i-4i+3+12=0

We add all the numbers together, and all the variables

5i+15=0

We move all terms containing i to the left, all other terms to the right

5i=-15

i=-15/5

i=-3

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